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a { display: block; float:left; margin:5px; height: 37px;line-height: 37px; 
text-align: center; background: url(../img/b4.png) no-repeat 0px 0px; 
color: #d84700; font-size: 14px; font-weight: bold; text-decoration: none; padding-left: 0px; }

a span { display:block; background: url(../img/b4.png) no-repeat right 0px;padding-right: 15px;}


a:hover { background: url(../img/b4.png) no-repeat 0px -37px;}
a:hover span{ background: url(../img/b4.png) no-repeat right -37px;}
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